package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;

import com.sky.service.DishService;
import com.sky.vo.DishVO;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class DishServiceImpl implements DishService {

   @Autowired
   private DishMapper dishMapper;
   @Autowired
   private DishFlavorMapper dishFlavorMapper;
   @Autowired
   private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishService dishService;

    /**
     * 新增菜品和对应的口味
     * @parm dishDTO
     */
    public void saveWithFlavor(DishDTO dishDTO) {

         Dish dish=new Dish();//只需要传进去一个实体就ok，因为dishDTO包含了更多的一个东西，需要Dish里的一些，只拷一些Dish里需要的参数赋上值

        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条数据
      dishMapper.insert(dish);
     //生成insert语句生成的主键值
      Long dishId=dish.getId();

       List<DishFlavor> flavors=dishDTO.getFlavors();
       if(flavors!=null&&flavors.size()>0){
           flavors.forEach(dishFlavor -> {
            dishFlavor.setDishId(dishId);
           });
           //向口味表插入n跳数据
         dishFlavorMapper.insertBatch(flavors);
       }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO){
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids){
        //判断当前菜品是否能够删除--是否存在起售中的菜品？？
        for (Long id : ids) {
             Dish dish=dishMapper.getById(id);
         if(dish.getStatus()== StatusConstant.ENABLE){
             //当前菜品处于起售中，不能删除
             throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
         }
        }
        //判断当前菜品是否能够删除--是否被套餐关联？？
      List<Long> setmealIds=setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds!=null && setmealIds.size()>0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
     for(Long id :ids){
         dishMapper.deleteById(id);
         //删除菜品关联的口味数据
         dishFlavorMapper.deleteByDishId(id);
     }
    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return
     */
      public DishVO getByIdWithFlavor(Long id){
        //根据id查询菜品数据
          Dish dish=dishMapper.getById(id);
          //根据菜品id查询口味数据
          List<DishFlavor> dishFlavors =dishFlavorMapper.getByDishId(id);
          //将查询到的数据封装到VO
          DishVO dishVO=new DishVO();
          BeanUtils.copyProperties(dish,dishVO);
          dishVO.setFlavors(dishFlavors);
        return dishVO;
     }
    /**
     * 根据Id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品基本信息
        dishMapper.update(dish);
        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors!=null&& flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish =Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        return dishMapper.list(dish);
    }


}
